index.css

* { /*Definindo padrão de margem, tamanho e padding */
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root{
  --border: 1px solid #ffffff1a
}

body, table, input, button{
  /* Escolhendo a fonte padrão para principais seletores*/
  font: 300 16px/140% 'Roboto', sans-serif;
}

body{
  /*Escolhendo a cor do fundo e das letras */
  background-color: #000000;
  color: white;
}

.container{
  max-width: 690px;
  margin: 0 auto;
  padding: 20px 32px;
}

header{
  padding: 20px 0;
}

form{
  border: var(--border);
  border-inline: none;
  padding: 20px 0;
}

fieldset{
  border: none;
}

fieldset > div{
  display: flex;
  gap: 12px;
}

.input-wrapper{
  flex: 1;

  display: flex;
  align-items: center;
  gap: 12px;

  border: var(--border);
  border-radius: 10px; /* Arrendondamento da borda */

  padding: 8px 12px;

  font: 400 14px/150% 'Roboto', sans-serif;
  color: #c4c4cc;
}

input{
  all: unset;
}

fieldset legend, section h2{
  font: 700 16px/140%, 'Roboto', sans-serif;
  color: #e1e1e6;
  padding-bottom: 16px;
}

fieldset button{
  width: fit-content;
  background: #F48F56;
  border: 0;
  border-radius: 10px;
  padding: 7px 20px;

  font: 700 12px/24px 'Roboto', sans-serif;
  color: #00292E;

}

fieldset button:hover{
  background: #f37c37;
}

.lista-participantes {
  padding: 20px 0;
}

.lista-participantes > div {
  border: var(--border);
  border-radius: 8px;
}
table{
  border-collapse: collapse;
}

table thead{
  font-size: 14px;
  line-height: 16px;
}

thead th, 
tbody td{
  padding: 12px 16px ;
}

tbody td{
  border-top: var(--border);
  font-size: 13px;
  line-height: 15px;
  color: #c4c4cc;
}

tbody td strong{
  color: white;
  font-size: 14px;
  line-height: 16px;
  font-weight: 600;
}

tbody td small{
  font-size: 12px;
  line-height: 16px;
}

tbody td button{
  all: unset;
  color: #9FF9CC;
}

tbody td button:hover{
  text-decoration: underline;
}